Hydrocyclone Desander Desilters are the important solids control equiments for drilling mud, GN Solids Control provide high quality desander desilter for oil gas drilling, CBM Drilling, underground projects desanding plant. Desander and desilter can be mounted on shale shaker to make it as assembly of mud cleaner.

Tag Archives: dewatering unit

This week GN solids control shipped 2 units of chemical dosing system with 2 big bowl big volume decanter centrifuge to our Singapore Clients for TBM waste mud treatment. This is not the first time for GN to ship such dewatering unit to Singapore for TBM waste water treatment project, several years ago we shipped another unit of containerized dewatering unit with decanter centrifuge installed inside 20ft container for convenient shipment, operation and rain proof.

GNLW553C-VFD decanter centrifuge is a 22 inch bowl diameter centrifuge, this is not the largest centrifuge GN can produce, we also have GNLW764-VFD with 30 inch bowl diameter centrifuge, it can be used for Tunneling project when huge amount water/ sludge is required for the operation.

The working principal is as below:

The chemicals are added in the chemical dosing system and mixed, then the dosing pump will transfer the chemicals to the decanter centrifuge feed tube, the chemicals will be added to the waste water/ waste sludge from the TBM and after treatment, the ultra fine solids will be separated out from the waste water so they can be reused for the TBM operation. The centrifuge mechanical separation cut point is 2~5 microns, if most of the solids inside the waste water is smaller than 2 microns, it is hard to separate out them, you have to add flocculant to make them flocculation and easy to be separated by the high speed decanter centrifuge.

The max rotary speed of the decanter centrifuge is 2500rpm, it can be adjusted by the VFD control panel with PLC smart control. The normal operation speed is 2200rpm. The dewatering unit /chemical dosing system are installed inside 20ft container for convenient operation, maintenance, and rain/ sun proof.

GN solids control showed our high speed decanter centrifuge at Petro-tech 2016 in India, a lot of clients showed interests on our decanter centrifuge. GN decanter centrifuge can be used for the industries below:
(1) Oil sludge separation: the VFD decanter centrifuge can separate ultra fine solids from the oil water mixture fluids by adding chemicals, then feed to the 3 phase separation system.

(2) Drilling waste management system: VFD decanter centrifuge can separate fine solids from the drilling fluids discharged from the vertical cuttings dryer, the solids content in the cuttings discharged by the vertical cuttings dryer is under 5%.
(3) Solids control system: high speed decanter centrifuge can separate barite from the drilling fluids, to reuse the barite can save huge cost for the drilling company, also it can separate the low gravity solids from the drilling fluids to reuse the drilling fluids.
(4) Waste water treatment: with dewatering unit and polymer dosing system, the decanter centrifuge can separate solids from waste water as thickening centrifuge.
The solids discharged from the decanter centrifuge is dry enough like a cake, you can adjust the humidity of the discharged solids by adjust the pond depth plate on the big end of the centrifuge bowl.
GN high configuration decanter centrifuge is suitable for the working conditions as below:
High temperature drilling fluids/ oil sludge after heating and mixing
High temperature working environment, even in middle east and India
Duplex stainless steel and stainless steel 316L bowl material can work for hazardous PH value waste water

GN solids control have decanter centrifuge in stock both in our China facility and Houston warehouse, welcome to contact GN solids control for purchasing. Before feeding to decanter centrifuge, if the solids content is over 30% or there is big solids size over 2mm, pls use GN high G force shale shaker to reduce the solids content firstly.

Recently GN solids control is going to ship one set of oil sludge waste treatment system to Africa for a oilfield service company. The oil sludge waste is coming from crude oil tank cleaning, refinery, solids control drilling waste, etc. GN drilling waste management equipments are also using in South America for oil sludge waste treatment system for the same applications.

This customized oil sludge treatment system is composed of 5 parts, each part as a separated modular:
Part 1: shaker skid
The shaker skid including one unit of high G drying shaker and 1 set of skid mounted mud tank. The function of this unit is to separate big solids from the oil waste.
Part 2: Centrifuge skid

The centrifuge skid including one unit of high speed decanter centrifuge and 1 set of skid mounted mud tank, the centrifuge with 4 supporting legs on the mud tank, for the centrifuge mounted on the telescopic skid, there is no such supporting legs, only skid.
Part 3: Dewatering Unit
The dewatering unit is mounted on the skid of the centrifuge unit for convenient operation and transportation. The 3 compartment polymer mixing tank with dozing system and control system composed of dewatering unit. We have option to put them in the 20ft container or not, but the client need to make a proof cover on top of the dewatering unit if no container.
Part 4: Acid & Alkali Liquid storage SkidContinue reading →

GN solids control finished the exhibition of ADIPEC this week, we showed our decanter centrifuge and shaker screens this year, this is the third time for GN solids control to attend this exhibition and every year we received inquires from lots of clients.

GNLW363CG decanter centrifuge is the best sold centrifuge during the past years after we introduced advance production line. This 14 inch diameter bowl centrifuge has been widely used for drilling solids control system, drilling waste management system( together with high G dryer and vertical G dryer), dewatering unit, oily sludge treatment plant, waste water cleaning system.

Different with the previous clients, right now most of GN clients are from drilling waste management industry. GN decanter centrifuge together with our containerized dozing system are popular to treat the water based mud by adding polymer, flocculant or coagulant, the discharged water is clear enough for disposal or go to the water treatment plant, the solids can meet the disposal standard for landfill or injection.
Features of GNLW363 series decanter centrifuge is as below compared with other brand decanter centrifuge made in China:

1) Screw conveyor is protected by tungsten carbide tiles( interchangeable)
2) Solids discharge port and liquids distribution port is protected by special ceramics insert and it is replaceable.
3) Centrifuge bowl material is duplex stainless steel 2205 by centrifugal casting.
4) We can provide telescopic skid frame or mud tank to fit the centrifuge on it.
5) The bearings are SKF brand

6) The vibration sensor, heat sensor and over-torque protection is for option to protect the centrifuge, our standard protection is installed inside the VFD control panel, emergency stop button is installed in the obvious area.
If you are interested to buy the centrifuge we showed at ADIPEC, pls contact with GN sales engineer for the cost and delivery time.

As one of the most professional designer and manufacturer of decanter centrifuge in China, GN solids control produced high speed decanter centrifuge and VFD centrifuge have been widely used for WBM, OBM, SOBM drilling waste management, oil & gas drilling solids control system, dewatering unit, oily sludge treatment plant, waste water treatment, mining, etc applications. All of our decanter centrifuges are electric motor and control panel drived, now we have full hydraulic drive decanter centrifuge to meet some client’s requirement when electricity is limited in some areas.

The mechanical components are same with the electric drive decanter centrifuge with features as below:
1) screw protection: tungsten carebide tiles for longer service life
2) Bowl material: duplex stainless steel 2205 from centrifugal casting and stainless steel 316L
3) Bearing brand: SKF brand
4) Solids discharge port & fluids distribution port protected by special ceramic insert interchangeable for conveneint maintenance
5) Control system with PLC smart control, especially for the monitoring and safety system: There are monistor for oil level shutdown, temperature alarm, manometric, etc. For safety operation.
6) Full Hydraulic drive system can smoothly work at high temperature environmen without problem, especially for heavy mud treatment
7) Heavy duty Gearbox with high torque up to 4164N.m.Continue reading →

Recently GN solids control start to apply our decanter centrifuge for industries except for oil & gas drilling, constructions industry, for example, industry waste water treatment, oil tank bottom cleaning, solids waste treatment, etc.
GNLW553C-VFD big bowl decanter centrifuge with dosing system can be used for industry waste water treatment. We have 3 models decanter centrifuges can be used together with dosing system. GNLW363CG-VFD is with 14inch bowl decanter centrifuge, which is the most popular model. GNLW453C-VFD is the 18 inch bowl decanter centrifuge, it is the middle model. GNLW553C-VFD is with 22 inch diameter big bowl which is the biggest model decanter centrifuge.

The dosing system is installed inside a 20ft container, with lights, windows, doors, air conditioner, etc, for convenient operation and transportation. To reduce the total cost of the dosing system, the dosing system with only a polyurethane material mixing tank and 2 dosing pump with electric control panel. The VFD control panel is not same configuration with oilfield explosion proof VFD control panel, it is a low cost special designed for non explosion proof applications, for example, TBM, dredging slurry separation, sewage water treatment, etc. The non exploson proof VFD control panel is also PLC smart control and touch screen, but the cover is not full of stainless steel material.Continue reading →

GN solids control designed and produced slurry separation system has been used for traditional oil & gas drilling solids control system and HDD & CBM, water well drilling, it has been also used for dredging slurry separation, TBM slurry separation, bored piling, liquid mud plant, core drilling solids removal unit, industry waste water treatment.
Dredging slurry separation system is usually used together with dewatering unit with dewatering centrifuge, GNLW363CG-VFD, GNLW453C-VFD , GNLW553C-VFD decanter centrifuges are the most common models used for dewatering unit.

The working principal is as below:
1) Filter screen to separate big stones, solids before feeding to our slurry separation system, to protect the first phase cleaning shaker screens, so the working life of shaker screen could be longer.
2) Use submersible slurry pump to feed to the shale shaker with coarse mesh shaker screen, to reduce the solids content, separate the big solids, the cut point is API40 @ 420 microns.
3) Desander cone 10 inch as second phase cleaning equipments to separate solids up to 75 microns, centrifugal pump works as desander cone feeding pump
4) Desilter cone 4 inch as the third phase cleaning equipments to separate solids up to 20 microns, centrifugal pump works as desilter cone feeding pump.Continue reading →

Recently GN delivered a new designed solidification unit to our domestic client, it has been improved based on the previous design with the bigger storage capacity for solidification agent, flushing system, stronger mixing unit for heavy duty operation.

According to the feedback from the client’s rigsite, the storage capacity of chemicals is not big enough for drilling waste with more fluids, so the solidification agent storage box is bigger in the new design, so the new solidification unit could be used for multi drilling waste status- with more fluids content or with less.
Another change on the new solidification unit is the feeding hopper skid, the feeding hopper is much bigger than the previous stabilization unit, we consider the international container shipment cost, the auger could be disassembly during shipment and the whole solidification unit could be shipped by a 40 ft container.
Solidification unit is an economic way for drilling cuttings disposal when the fluids content is not too much, if the environmental laws is permit, but in some countries, solidification unit is not acceptable for environmental laws. Too much solidification agent cement and calc will be wasted and the cost will be higher compared with the performance.
Except for solidification unit, GN solids control also provided drilling waste management system, Thermal Desorption Unit, dewatering unit, vacuum unit, Screw conveyor, decanter centrifuge, vertical cuttings dryer, high G dryer shaker, Mono pump, etc. Solidification unit and dewatering unit, decanter centrifuge and high G dryer is normally used for water based drilling cuttings, vertical cuttings dryer system is normally used for oil based drilling cuttings.
We will keep improving our solidification unit according to the feedback of our clients, user friendly and the performance is our target to make our client satisfied. For more information of drilling cuttings disposal, pls contact with GN solids control.

Decanter centrifuges are one of our main equipments with core technology, especially we invest another new factory and have a particular workshop for the manufacturing of decanter centrifuge and vertical cuttings dryer. For immediate shipment and considering the period to move to new factory, we prepared 50 units of 14 inch decanter centrifuge in stock, which make our delivery time very fast compared with other competitors.

The clients in Europe always required decanter centrifuge with ATEX explosion proof certificate, CE certificate and ISO, API, and DNV certificate( for offshore project). They are strict for the technical specification and performance, documents. The client also need the centrifuge urgently, because of the adequate stock, we can meet the client’s delivery time even though they required so many special certificates.
The decanter centrifuges sold to different markets with different standards and certificates. For example, the decanter centrifuges stocked in Houston with IEC explosion proof certificate electric motor and control panel/ VFD control cabinet, application in class 1 division 1. The VFD control panel is positive pressured with full of stainless steel material. The decanter centrifuge stocked in China with China explosion proof certificate, Ex marks: Ex d II Bt4 Gb for Zone 2 applications. The decanter centrifuge in India with ATEX certificate for class 1 zone 1, and motor and control panel is DGMS approved, the same for the cables and glands, connections.Continue reading →